# Supply and Demand

Business Finance

# Module 1 – Case

## SUPPLY AND DEMAND

### Assignment Overview

Before beginning this assignment, make sure you have gone carefully through all of the required readings for this module. It is very important to carefully absorb the general concepts as well as the numerical examples in the background readings. For this assignment, you will have to answer some purely conceptual questions, as well as some numerical problems. For conceptual questions, make sure to thoroughly explain your answers and to cite specific readings from the required background materials to explain your answers. For numerical problems, make sure to show all of your work and explain how you arrived at your answers (partial credit can be given if you get the final answer wrong but do some of the steps correctly).

### Case Assignment

Part A: Conceptual questions

- Suppose you own a pet shop. Your sales are decent but a marketing consultant tells you that you could increase your sales and be able to charge a higher price if you spend some money on local television ads. If the consultant is right, will advertising lead to an increase in quantity demanded? Or a shift in the demand curve? Both? Neither? Explain your answer and make sure to cite at least one of the required readings in your answer.
- You are the owner of a furniture factory. You normally produce 100 pieces of furniture a day because that is how much you can produce given the amount of qualified workers in your town and the amount of reasonably priced wood that you can purchase locally. Then one day you get an order from a large national retail chain who wants to purchase 200 pieces of furniture a day from you. You are hesitant, as you will have to pay higher wages to get some qualified workers to move to your town. You also will need to pay higher prices for wood because you will no longer be able to rely solely on local suppliers and will have to spend more on shipping wood from other towns. But you drive a hard bargain and the retail chain agrees to pay one and a half times your normal price. Does this situation describe a change in quantity supplied? A shift in the supply curve? Both? Neither? Explain your answer and make sure to cite at least one of the required readings in your answer.
- Suppose marijuana has just been legalized in your state. Nobody in your home town wants to start a marijuana business, as this would be too much of a stigma. But being an MBA student, you know a good business opportunity when you see one and decide to take a stab. Shortly after starting up your business, you gain a loyal following of customers and start raking in some steep profits. However, the local government decides that they want a cut of your profits and starts charging a 20% sales tax on marijuana. Do you think this would lead to a 20% or greater loss in sales? Do you think marijuana in this situation would be facing inelastic or elastic demand? Explain your reasoning, and make sure to cite at least one of the required readings regarding elasticity.

Part B Quantitative Problem

Suppose the demand function for a new smartphone can be expressed as QD = 1000 – 1.5P with QD being quantity demanded and P being price. The supply function can be expressed as QS = 50 + 2P

Fill out the following table using the above equations:

Price |
Quantity Demanded |
Quantity Supplied |
Surplus Amount or Shortage Amount |

200 |
|||

220 |
|||

240 |
|||

260 |
|||

280 |
|||

300 |
|||

320 |
|||

340 |

Now answer the following questions:

- What is the equilibrium price? You can compute this either using Microsoft Excel, or by using algebra from the equations above and solving for a price where quantity supplied equals quantity demanded. Show your work by either showing the algebra steps or by showing how you used Excel to calculate.
- Suppose the supply function changes to 100 + 2P. What is the new equilibrium? Show your work by either showing the algebra steps or by showing how you used Excel to calculate.

### Assignment Expectations

- Answer the assignment questions directly.
- Stay focused on the precise assignment questions. Do not go off on tangents or devote a lot of space to summarizing general background materials.
- For computational problems, make sure to show your work and explain your steps.

For short answer/short essay questions, make sure to reference your sources of information with both a bibliography and in-text citations. See the Student Guide to Writing a High-Quality Academic Paper, including pages 11-14 on in-text citations. Another resource is the “Writing Style Guide,” which is found under “My Resources” in the TLC Portal.

**Required Material**

Tabarrok, A. & Cowen, T. (2015) The demand curve. Marginal Revolution University. https://www.youtube.com/watch?v=kUPm2tMCbGE

Tabarrok, A. & Cowen, T. (2015) The supply curve. Marginal Revolution University. https://www.youtube.com/watch?v=nKvrbOq1OfI

Stengel, D. (2012). Managerial Economics Principles. Flat World Education. http://saylordotorg.github.io/text_principles-of-managerial-economics/

Taylor, T. (2014) *Principles of Microeconomics.* OpenStax College. http://cnx.org/contents/6i8iXmBj@10.174:UfIHC0qu@6/Introduction-to-Demand-and-Sup